Rats are usually easier especially when the BP reaches adult. That's why most people switch. Easier to feed 1 rat than 4 or 5 mice at a time. Nutritionally it makes no difference as long as they are getting an adequate amount of food. Some BP's only eat mice so the decision is already made.
Mouse fuzzies are very small. Too small for all but special cases of extremely small babies, IMO. Almost all baby bp's are big enough for hoppers right out of the egg. Just as an example, I recently had one baby who had not eaten for almost 7 weeks start eating. He weighed 58g at the time. He took an 11g mouse hopper.
My babies get mouse hoppers for their first few meals depending on size of baby. At around 80g or 85g they go to adult mice for a couple or three feedings. At around 100 to 120g they go to rat pups depending on size of rat pups I have. Transition points will vary depending on snake, food size, and how fast the snake grows, but they aren't mice for more than a month usually before I start trying to switch them to rat pups. Some people do this sooner than I do with great success.
I would say your Kirby can go on rat pups right now. They weigh anywhere from 18g to 25g or 30g most of the time so that should be fine for him.
New baby can go on adult mice with a switch to rat pups in 1 or 2 weeks probably (depending on how much you feed and how fast she goes).
Different people do things slightly different though. Thats just how it seems to have been working out for me.
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